/**
 * State reader — hardcoded JSON for Phase 2, WebSocket in Phase 3.
 *
 * Provides Timmy's current state to the scene. In Phase 2 this is a
 * static default; the WebSocket path is stubbed for future use.
 */

const DEFAULTS = {
    timmyState: {
        mood: "focused",
        activity: "Pondering the arcane arts",
        energy: 0.6,
        confidence: 0.7,
    },
    activeThreads: [],
    recentEvents: [],
    concerns: [],
    visitorPresent: false,
    updatedAt: new Date().toISOString(),
    version: 1,
};

export class StateReader {
    constructor() {
        this.state = { ...DEFAULTS };
        this.listeners = [];
        this._ws = null;
    }

    /** Subscribe to state changes. */
    onChange(fn) {
        this.listeners.push(fn);
    }

    /** Notify all listeners. */
    _notify() {
        for (const fn of this.listeners) {
            try {
                fn(this.state);
            } catch (e) {
                console.warn("State listener error:", e);
            }
        }
    }

    /** Try to connect to the world WebSocket for live updates. */
    connect() {
        const proto = location.protocol === "https:" ? "wss:" : "ws:";
        const url = `${proto}//${location.host}/api/world/ws`;
        try {
            this._ws = new WebSocket(url);
            this._ws.onopen = () => {
                const dot = document.getElementById("connection-dot");
                if (dot) dot.classList.add("connected");
            };
            this._ws.onclose = () => {
                const dot = document.getElementById("connection-dot");
                if (dot) dot.classList.remove("connected");
            };
            this._ws.onmessage = (ev) => {
                try {
                    const msg = JSON.parse(ev.data);
                    if (msg.type === "world_state" || msg.type === "timmy_state") {
                        if (msg.timmyState) this.state.timmyState = msg.timmyState;
                        if (msg.mood) {
                            this.state.timmyState.mood = msg.mood;
                            this.state.timmyState.activity = msg.activity || "";
                            this.state.timmyState.energy = msg.energy ?? 0.5;
                        }
                        this._notify();
                    }
                } catch (e) {
                    /* ignore parse errors */
                }
            };
        } catch (e) {
            console.warn("WebSocket unavailable — using static state");
        }
    }

    /** Current mood string. */
    get mood() {
        return this.state.timmyState.mood;
    }

    /** Current activity string. */
    get activity() {
        return this.state.timmyState.activity;
    }

    /** Energy level 0-1. */
    get energy() {
        return this.state.timmyState.energy;
    }
}